The dosing calculator is free forever, with no account and no ads. Premium adds the tools you want once you are testing every week. Final prices are shown in the App Store at purchase and may differ by country.
The core, forever
7-day free trial on the yearly plan
or $4.99/month
One-time purchase, yours forever
Nothing to download and nothing to use the dosing calculator, the test log, trends and water balance. Premium is $4.99 per month or $19.99 per year. Lifetime is a single $39.99 purchase.
Yes, 7 days on the yearly plan. The monthly plan has no trial, and Lifetime is a one-time purchase rather than a subscription.
Exact dosing for every chemical, unlimited test logging with history and trend charts, water balance (LSI), guided Shock Mode, the pool chemistry glossary, three troubleshooting guides, a weekly reminder, widgets, Siri shortcuts, CSV import and export, and full backup and restore.
Nothing is deleted and the app does not lock. Premium features stop and everything you logged stays readable on your device.
No. There is no sign-up anywhere in the app, which is why the App Store privacy label says Data Not Collected.
Either. Premium is monthly or yearly, and Lifetime is a single purchase that also unlocks multiple pools and spas.
Enter your test numbers and see the exact dose. Upgrade later, or never.